【摘要】：我國含煤地層共伴生礦物種類較多,資源量較大,其中京西門頭溝石炭-二疊紀(jì)煤系中的葉蠟石泥巖比較罕見,具有重要的開發(fā)利用價(jià)值。利用偏光顯微鏡、X射線衍射(XRD)、紅外光譜(IR)、熱分析(TA)、電子探針(EPM)等測(cè)試手段,從礦物學(xué)角度對(duì)北京西山門頭溝紅廟嶺組葉臘石礦物學(xué)特征進(jìn)行研究。結(jié)果表明,研究區(qū)泥巖葉臘石與硬水鋁石、硬綠泥石等礦物共生,偏光顯微鏡下葉臘石通常呈隱晶或微晶鱗片狀,定向分布。基于微區(qū)電子探針化學(xué)分析計(jì)算得出的葉臘石晶體結(jié)構(gòu)化學(xué)式為:Al_(1.9965)(Si_(3.9982)O_(10))(O_2H_(2.0180))。根據(jù)沉積地質(zhì)背景和共生礦物組合特征,推斷葉臘石的形成溫度在300℃左右,認(rèn)為京西門頭溝區(qū)葉臘石為高嶺石受到構(gòu)造應(yīng)力影響形成的動(dòng)力變質(zhì)礦物。
[Abstract]:There are many associated minerals in coal-bearing strata in China, and the amount of resources is large. Among them, pyrophyllite mudstone in Mentougou Carboniferous and Permian coal series in western Beijing is rare and has important value in exploitation and utilization. The mineralogical characteristics of pyrophyllite from the Xishan Mentougou Hongmiaoling formation in Beijing were studied from the mineralogical point of view by means of X-ray diffraction (XRD), IR (IR), thermal analysis (TA), electron probe (EPM) and so on. The results show that the mudstone pyrophyllite is symbiotic with hard boehmite and hard chlorite etc. The pyrophyllite is usually cryptic or microcrystalline scale and distributes orientedly under polarizing microscope. The chemical formula of pyrophyllite crystal structure based on microsphere electron probe chemical analysis is: 1: al _ (1.9965) (Si _ (3.9982) O _ (10) () O _ (2.0180).) Based on the sedimentary geological background and the characteristics of symbiotic mineral assemblage, the formation temperature of pyrophyllite is inferred to be about 300 鈩，

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